Metformin Daily Dosage


I am 82 years old and diabetic since 2012. My post-lunch levels are always within the permitted levels, but my fasting levels go up to 125 occasionally or sometimes continually. I am taking Sitagliptin 100 mg and Metformin 500 mg in the morning after breakfast and 250 mg Glyciphage after lunch, and 500 mg Glyciphage after dinner, but the fasting levels have not come down to the desirable level. My doc asked me to take Sitagliptin and Metformin 100/ 500 after breakfast and 750 mg after dinner. Can I take this much Metformin dosage at night? Does it lead to hypoglycemia during the night or early morning. Is the dosage is not high. Kindly advise. Another doctor friend suggested Sitagliptin 100 mg/Metformin 1000 mg and Dapaglilflozin 10 mg to take and nothing else during the day and asked me to discontinue the Glyciphage of 250 mg and 500 mg. What's your advice?

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